The bombing suspects are Russian natives who moved to the Boston area. Russian authorities told U.S. officials before the bombings they had concerns about the family but only revealed details of wiretapped conversations since the attack.

- A medical examiner has determined but did not release the cause of death for Tamerlan Tsarnaev, authorities said. His body is unclaimed, and authorities said the information will remain private until his remains are released and a death certificate is filed.

Police have said he ran out of ammunition during the gunbattle before his brother dragged his body under a vehicle while fleeing.

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AP Special Correspondent Linda Deutsch in Los Angeles contributed to this report.